CN112541282A - Extraction method for transient load of coal rock containing gangue cut by spiral drum of coal mining machine - Google Patents
Extraction method for transient load of coal rock containing gangue cut by spiral drum of coal mining machine Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 178
- 238000005065 mining Methods 0.000 title claims abstract description 86
- 239000011435 rock Substances 0.000 title claims abstract description 58
- 230000001052 transient effect Effects 0.000 title claims abstract description 14
- 238000000605 extraction Methods 0.000 title claims description 5
- 238000005520 cutting process Methods 0.000 claims abstract description 38
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- 239000007787 solid Substances 0.000 claims description 11
- 230000007935 neutral effect Effects 0.000 claims description 10
- 125000000174 L-prolyl group Chemical group [H]N1C([H])([H])C([H])([H])C([H])([H])[C@@]1([H])C(*)=O 0.000 claims description 8
- 239000008239 natural water Substances 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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Abstract
The invention provides a method for extracting transient load containing gangue when a spiral drum of a coal mining machine cuts coal containing gangue, which comprises the steps of obtaining physical and mechanical property parameters of the coal containing gangue and structural parameters of the coal mining machine; assembling a three-dimensional entity assembly model of the coal mining machine; establishing a rigid-flexible coupling virtual prototype model of the coal mining machine; establishing a coal wall model containing gangue coal rocks; establishing a simulation model for the spiral drum of the coal mining machine to cut the discrete elements containing the gangue, and performing cutting simulation by adopting EDEM and ADAMS interfaces EALink to couple the discrete elements of the drum and the ADAMS in a two-way mode to obtain an instantaneous change curve of the three-way force load of the spiral drum of the coal mining machine.
Description
Technical Field
The invention belongs to the technical field of coal mining equipment, and particularly relates to a method for extracting transient load of a coal rock containing gangue cut by a spiral drum of a coal mining machine.
Background
The load of the spiral drum serving as a working mechanism for cutting the coal wall of the coal mining machine has an important influence on the reliability of the coal mining machine. Especially, when the coal seam contains harder gangue, the spiral drum of the coal mining machine is subjected to larger impact load, the load on the spiral drum for cutting the coal seam containing the gangue is extracted, and the method has practical significance for strength design and reliability design of the spiral drum of the coal mining machine and research on cutting tooth breakage, abrasion and the like. At present, the following methods are mainly used for extracting the load of the helical drum of the coal mining machine: 1. the load borne by each cutting tooth of the spiral drum is calculated by using the existing calculation formula, the load is concentrated on the center of mass of the drum, and then an MATLAB program is adopted to obtain the load of the drum of the coal mining machine. The method has more related parameters and larger parameter value range, and inevitably generates larger human errors. 2. And simulating the load of the roller of the coal mining machine by using a finite element analysis software LS-DYNA. The coal in the LS-DYNA is made of viscoelastic plastic materials, and the units can be automatically removed after failure, so that the action load of cutting force on the roller can only be reflected, and the influence of coal loading counterforce on the spiral roller cannot be reflected due to automatic removal of cut coal. 3. The actual measurement is carried out by adopting a physical experiment method. The physical measurement method needs to establish a coal mining machine loading experiment table, manufacture an experiment roller, purchase a corresponding sensor and connect a test line. Due to actual physical experiments, cement and sand are mixed in a certain proportion on the coal wall, and the coal wall with certain strength is formed after solidification. 4. By utilizing a discrete element modeling method, Chinese patent CN107066743A discloses a method for extracting the load of a helical drum of a coal mining machine based on a discrete element method, which is suitable for extracting the load of pure coal rock cut by the helical drum of the coal mining machine and is not suitable for coal rock containing gangue, and in addition, the method can not be used for researching the influence of the load of the drum when a cutting part is deformed or changes in position, angular velocity and angular acceleration of the drum are generated. In conclusion, it is necessary to develop a method for extracting the cutting transient load of the helical drum of the coal mining machine containing the gangue rocks.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a transient load extraction method for cutting a coal rock containing gangue by a spiral drum of a coal mining machine, which realizes the establishment of a model of the coal rock containing gangue, fully considers the deformation of a cutting part caused by the cutting force action of the spiral drum of the coal mining machine, and can judge the stress condition of the spiral drum of the coal mining machine cutting the coal rock containing gangue. The technical scheme of the invention is as follows:
the extraction method of the transient load of the gangue-containing coal rock cut by the spiral drum of the coal mining machine comprises the following steps:
(1) acquiring physical and mechanical property parameters of the gangue-containing coal rocks and structural parameters of a coal mining machine;
(2) according to the structural parameters of the coal mining machine, adopting Pro/E to establish a three-dimensional entity model of each part of the coal mining machine, and then assembling the three-dimensional entity model into a three-dimensional entity assembly model of the coal mining machine; respectively guiding three-dimensional entity models of the cutting part shell, the planet carrier and the planet shaft of the coal cutter into ANSYS through interfaces of Pro/E and ANSYS, and generating modal neutral files of three flexible parts, namely the cutting part shell, the planet carrier and the planet shaft, in the ANSYS;
(3) according to the three-dimensional entity assembly model of the coal mining machine and the modal neutral files of the three flexible pieces, introducing the three-dimensional entity assembly model of the coal mining machine into the ADAMS by using interfaces of proe and the ADAMS, and replacing a cutting part shell, a planet carrier and a planet shaft of the coal mining machine with the modal neutral files of the three flexible pieces in the ADAMS; and sets up the kinematic pair among each spare part according to the movement situation of the coal-winning machine; the method realizes the establishment of the rigid-flexible coupling virtual prototype model of the coal mining machine in the ADAMS.
(4) According to the physical and mechanical property parameters of the coal containing the gangue, establishing a coal wall model of the coal containing the gangue by using EDEM;
(5) converting the three-dimensional solid assembly model of the spiral drum of the coal mining machine into an IGES format, introducing the three-dimensional solid assembly model into the coal wall model containing the gangue rocks, selecting a merging geometry during introduction, and establishing a simulation model of cutting the gangue-containing discrete elements by the spiral drum of the coal mining machine;
(6) starting ADAMS, adopting an interface EALink of EDEM and ADAMS to couple discrete elements of a roller with ADAMS in a two-way mode, simulating in a rigid-flexible coupling virtual prototype model of a coal mining machine, and simultaneously starting a spiral roller of the coal mining machine to cut a simulation model containing discrete elements containing waste rocks by the EALink to simulate so as to realize two-way coupling simulation;
(7) and (5) obtaining the instantaneous change curve of the three-way force load of the spiral drum of the coal mining machine in the EDEM post-processing.
Further, the physical and mechanical property parameters of the gangue-containing coal rock in the step (1) comprise: coal rock density, coal rock natural water content, coal rock tensile strength, coal rock compressive strength, coal rock elastic modulus, coal rock poisson ratio, coal rock cohesion, coal rock internal friction angle and coal rock firmness coefficient.
Further, the specific method for establishing the rigid-flexible coupling virtual prototype model of the coal mining machine in the step (3) comprises the following steps: introducing the three-dimensional entity assembly model of the coal mining machine obtained in the step (2) into ADAMS by utilizing pro/E and an interface of multi-body dynamics software ADAMS, and establishing a virtual prototype model of the coal mining machine; and respectively importing the modal neutral files of the cutting part shell, the planet carrier and the planet shaft into a virtual prototype model of the coal mining machine, replacing the front drum cutting part shell, the planet carrier and the planet shaft, and setting kinematic pairs among all parts according to the motion condition of the coal mining machine to obtain the rigid-flexible coupling virtual prototype model of the coal mining machine.
The invention has the beneficial effects that: the invention realizes the establishment of the model containing the gangue, fully considers the change of the rotating speed of the deformed spiral roller of the cutting part caused by the action of cutting force on the roller of the coal mining machine, and can judge the stress condition of the spiral roller of the coal mining machine cutting the gangue-containing roller. By the method, the transient loads of the coal mining machine rollers with different hardness, different positions and different structural rollers and different roller rotating speeds, different traction speeds and different cutting depths can be obtained, and the method for extracting the loads containing the gangue by roller cutting is rapid, economical and capable of reducing labor intensity.
Drawings
Fig. 1 is a rigid-flexible coupling virtual prototype model of a coal mining machine according to an embodiment of the invention.
FIG. 2 is a coal wall model containing gangue rocks according to an embodiment of the invention.
FIG. 3 providing rollers as coupling members in EALink
Fig. 4 is a three-directional force diagram of a shearer screw drum cutting a coal containing gangue according to an embodiment of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the following figures and specific examples, which are intended to be illustrative, but not limiting, of the invention.
The specific embodiment of the invention provides a method for extracting transient load of gangue-containing coal rocks cut by a spiral drum of a coal mining machine, the model of the adopted coal mining machine is MG2 × 55/250-BWD, physical and mechanical performance parameters of the adopted pyrite-containing nodule coal rocks are shown in Table 1, parameters of a particle contact model and parameters of the physical and mechanical performance of the coal are shown in Table 2, and the method for extracting the transient load comprises the following steps:
(1) acquiring physical and mechanical property parameters of the gangue-containing coal rocks and structural parameters of a coal mining machine, wherein the physical and mechanical property parameters of the gangue-containing coal rocks comprise: coal rock density, coal rock natural water content, coal rock tensile strength, coal rock compressive strength, coal rock elastic modulus, coal rock poisson ratio, coal rock cohesion, coal rock internal friction angle and coal rock firmness coefficient are shown in table 1.
TABLE 1 parameters of the physical and mechanical properties of the gangue-containing coal
TABLE 2 particle contact model parameters and coal physical mechanics parameters
(2) According to the structural parameters of the coal mining machine, Pro/E is adopted to establish a three-dimensional entity model of each part of the coal mining machine, the parts comprise a motor, a traction part, a traction chain, a cutting part reducer, a rocker arm, a roller, a bottom bracket, a sliding shoe, a height-adjusting oil cylinder and the like, and then the parts are assembled into a three-dimensional entity assembly model of the coal mining machine; and respectively guiding the three-dimensional entity models of the cutting part shell, the planet carrier and the planet shaft of the coal cutter into ANSYS through interfaces of Pro/E and ANSYS, and generating modal neutral files of the three flexible parts of the cutting part shell, the planet carrier and the planet shaft in the ANSYS.
(3) According to the three-dimensional solid assembly model of the coal mining machine and the modal neutral file of the flexible part, a rigid-flexible coupling virtual prototype model of the coal mining machine is established in ADAMS, and the concrete modeling method comprises the following steps: introducing the three-dimensional entity assembly model of the coal mining machine obtained in the step (2) into ADAMS by utilizing pro/E and an interface of multi-body dynamics software ADAMS, and establishing a virtual prototype model of the coal mining machine; and respectively importing the modal neutral files of the cutting part shell, the planet carrier and the planet shaft into a virtual prototype model of the coal mining machine, replacing the cutting part shell, the planet carrier and the planet shaft, and setting kinematic pairs among all parts according to the motion condition of the coal mining machine to obtain a rigid-flexible coupling virtual prototype model of the coal mining machine, as shown in fig. 1.
(4) According to the physical and mechanical property parameters of the coal containing the gangue, establishing a coal wall model of the coal containing the gangue by using EDEM; as shown in fig. 2, the specific modeling method is: according to the data and discrete element theory in the table 1, obtaining the Hertz-minilin with binding model parameters of the coal and the coal, the Hertz-minilin with binding model parameters of the gangue and the gangue, and the Hertz-minilin with binding model parameters of the gangue and the coal through calibration, wherein the Hertz-minilin with binding model parameters comprise: normal stiffness, tangential stiffness, normal stress, tangential stress; setting the shear modulus, the density, the Poisson ratio, the dynamic friction coefficient, the static friction coefficient, the restorability coefficient, the Hertz-Mindlin with binding model parameters of coal and coal, the Hertz-Mindlin with binding model parameters of gangue and coal and the Hertz-Mindlin with binding model parameters of gangue and coal in discrete element software EDEM, and then adopting a rapid filling method to establish a coal wall model containing gangue; FIG. 2 is a coal wall model containing gangue rocks.
(5) Converting a three-dimensional solid assembly model of a coal mining machine into an IGES format, guiding the three-dimensional solid assembly model into a coal wall model containing gangue rocks, establishing a simulation model for cutting the gangue-containing discrete elements by a spiral drum of the coal mining machine, setting the fixed time step length in the EDEM to be 20%, setting the target storage time interval to be 0.01s, setting the grid size to be 5 times of the minimum particle radius, and opening an ADAMS coupling service interface EAlink.
(6) The rotating speed of a motor of a cutting part of the coal mining machine is 10764.24 degrees/s, the rotating speed of a motor of a walking part is 5330.4 degrees/s, the rotating speed of a spiral drum of the coal mining machine is 95r/min, and the traction speed is 4 m/min. Starting EAlink in ADAMS, selecting a roller as a coupling component, and selecting bidirectional coupling as shown in FIG. 3; setting simulation time in EAlink to be 5s, setting simulation step length to be 0.0001s, wherein the step length is integral multiple (20 times) of the middle EDEM step length, clicking RUN button, and synchronously carrying out coal rock cutting simulation by the EDEM coal cutter when the coal cutter in ADAMS starts simulation.
(7) And after the simulation is finished, extracting three-way force and three-way moment curves of the spiral drum of the coal mining machine in the EDEM. Fig. 4 provides a three-way force profile of a shearer screw drum cutting a gangue containing coal rock. FIG. 4 fully reflects the transient three-directional force condition of the spiral drum cutting the coal rock containing the gangue.
It will be understood that modifications and variations can be resorted to by those skilled in the art, and that all such modifications and variations are intended to be within the scope of the invention as claimed.
Claims (3)
1. The extraction method of the transient load of the gangue-containing coal rock cut by the spiral drum of the coal mining machine is characterized by comprising the following steps:
(1) acquiring physical and mechanical property parameters of the gangue-containing coal rocks and structural parameters of a coal mining machine;
(2) according to the structural parameters of the coal mining machine, Pro/E is adopted to establish a three-dimensional solid model of each part of the coal mining machine,
then assembling into a three-dimensional solid assembly model of the coal mining machine, wherein the three-dimensional solid model of each part comprises a three-dimensional solid model of a spiral roller of the coal mining machine; respectively guiding three-dimensional entity models of a cutting part shell, a planet carrier and a planet shaft of the coal mining machine into ANsys through interfaces of PrO/E and ANsys, and generating modal neutral files of three flexible parts, namely the cutting part shell, the planet carrier and the planet shaft, in the ANsys;
(3) establishing ADAMS according to the three-dimensional solid assembly model of the coal mining machine and the modal neutral files of the three flexible parts
Combining rigid and flexible coupling of a coal mining machine with a virtual prototype model;
(4) according to the physical and mechanical property parameters of the coal containing the gangue, establishing a coal wall model of the coal containing the gangue by using EDEM;
(5) and converting the three-dimensional solid model of the spiral roller of the coal mining machine into an IGES format, introducing the IGES format into the coal wall model containing the gangue rocks, and bidirectionally coupling the discrete elements of the roller with ADAMS by adopting an interface EAlink of EDEM and ADAMS. Simulating in a rigid-flexible coupling virtual prototype model of the coal mining machine, and simultaneously starting a spiral roller of the coal mining machine to cut the simulation model containing the gangue discrete elements for simulation by using EALink;
(6) and (5) obtaining the instantaneous change curve of the three-way force load of the spiral drum of the coal mining machine in the EDEM post-processing.
2. The method for extracting the transient load of the coal rock containing the gangue when cut by the spiral drum of the coal mining machine according to claim 1, wherein the physical and mechanical performance parameters of the coal rock containing the gangue in the step (1) comprise coal rock density, natural water content of the coal rock, tensile strength of the coal rock, compressive strength of the coal rock, firmness coefficient of the coal rock, elastic modulus of the coal rock, Poisson's ratio of the coal rock, cohesion of the coal rock and internal friction angle of the coal rock.
3. The method for extracting the transient load of the gangue-containing coal rock cut by the spiral drum of the coal mining machine according to claim 1, wherein the concrete method for establishing the rigid-flexible coupling virtual prototype model of the coal mining machine in the step (3) is to introduce the three-dimensional entity assembly model of the coal mining machine obtained in the step (2) into an ADAMS (automatic dynamic analysis system) by utilizing interfaces of pro/E and multi-body dynamics software ADAMS to establish the virtual prototype model of the coal mining machine; and respectively importing the modal neutral files of the cutting part shell, the planet carrier and the planet shaft into the virtual prototype model of the coal mining machine, and replacing the cutting part shell, the planet carrier and the planet shaft to obtain the rigid-flexible coupling virtual prototype model of the coal mining machine.
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| Title |
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